Teleseismic waves generated by large earthquakes are known to trigger other earthquakes, even at a great distance, and seasonal atmospheric pressure variations have been shown to modulate microearthquake activity. ChiChing Liu et al. now report an unexpected geological phenomenon: earthquakes triggered by weather conditions. Data from borehole strain-meters in eastern Taiwan show that slow earthquakesrn- seismic events spanning hours and minutes rather than minutes and seconds - can be triggered by typhoons.
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